Gugudan (Hangul: 구구단, stylized as gugudan or gu9udan) is a South Korean girl group formed in 2016 by Jellyfish Entertainment. The group consists of nine members: Mimi, Hana, Haebin, Nayoung, Sejeong, Sally, Soyee, Mina and Hyeyeon.

In January 2016, Kim Na-young, Kim Se-jeong and Kang Mi-na were introduced as Jellyfish Entertainment’s first female trainees on the Mnet survival show Produce 101 where 101 female trainees from various companies competed to debut in an 11-member girl group that would promote for a year under YMC Entertainment. After placing 2nd and 9th respectively in the final episode, Sejeong and Mina eventually debuted as members of I.O.I in May 2016.

2016-present: Debut with “Wonderland”
Despite denying earlier reports about Sejeong and Mina debuting in a 7-member girl group in June, the company confirmed on June 7 that the two I.O.I members would debut within the month in what would be the company’s first girl group. Because of YMC Entertainment’s special terms in which I.O.I’s members are allowed to do activities under their respective companies while IOI was on break or while the group promoted in sub-units, there were no complications with the plan.

Nayoung was also confirmed as a member on June 10 and on June 13, the company revealed that Gugudan would be a 9-member group. On June 17, Jellyfish Entertainment announced the group name.

On June 22, the group confirmed that they were going for a “mermaid” concept. Following the announcement, a highlight medley of the group’s debut mini-album was released on June 24 and they eventually debuted on June 28, 2016 with the mini-album, Act. 1 The Little Mermaid, with “Wonderland” as the title song. The song’s music video was released online via a live countdown on the Naver V App.


Mimi, born Jung Mi-mi (Korean: 정미미) on January 1, 1993 (age 23). She is a former FNC Entertainment trainee. She represents the number 7.
Hana (Korean: 하나), born Shin Bo-ra (Korean: 신보라) on April 30, 1993 (age 23). She is the leader of the group. She represents the number 1.
Haebin, born Han Hae-bin (Korean: 한해빈) on August 16, 1995 (age 21). She represents the number 6.
Nayoung, born Kim Na-young (Korean: 김나영) on November 23, 1995 (age 20). She represented Jellyfish Entertainment along with Sejeong and Mina on the Mnet survival show Produce 101, where she placed 14th in the final episode. In April 2016, Nayoung made a cameo appearance in the music video of their label mate VIXX’s “Dynamite”.[16] She represents the number 4.
Sejeong, born Kim Se-jeong (Korean: 김세정) on August 28, 1996 (age 19). She represented Jellyfish Entertainment on Mnet’s Produce 101, where she placed second in the final episode and later made it into the final line-up for I.O.I, the project girl group of the program. Prior to Produce 101 and joining her company, Sejeong was a contestant on K-pop Star 2 and also worked as a fitting model. She represents the number 3.
Sally (Korean: 샐리), born Liu Xiening (Chinese: 刘些宁; pinyin: Liú Xiēníng, Korean: 류셰닝) on October 23, 1996 (age 19) in Guangdong, China. She is the only non-Korean member of the group. She represents the number 8.
Soyee (Korean: 소이), born Jang So-jin (Korean: 장소진) on November 21, 1996 (age 19). She is a former Cube Entertainment trainee. She represents the number 2.
Mina, born Kang Mi-na (Korean: 강미나) on December 4, 1999 (age 16). She was one of the three trainees from Jellyfish Entertainment that appeared on Produce 101, wherein she placed ninth in the final episode and debuted as a member of the 11-member girl group I.O.I. She represents the number 9.
Hyeyeon, born Cho Hye-yeon (Korean: 조혜연) on August 5, 2000 (age 16). She represents the number 5.

Extended plays
Title Album details Peak chart positions Sales

Act. 1 The Little Mermaid
Released: June 28, 2016
Label: Jellyfish Entertainment, CJ E&M
Formats: CD, digital download
2 8
KOR: 19,838+
“—” denotes releases that did not chart or were not released in that region.
Featured singles
Title Year Peak chart positions Sales Album

“Wonderland” 2016 35
KOR (DL): 100,182+
Act. 1 The Little Mermaid
“—” denotes releases that did not chart or were not released in that region.

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